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I attached a diode to the solenoid and it still fires. Whee. Always nice when you change something without it breaking. I also managed cut the daylight out of my finger (how'd the daylight get in?) so I taped up the edges of the hopper in a bloody mid-sparge rage. Safety is important.

Here's how the ring came together: https://scontent-a-sea.xx.fbcdn.net...6_10204099086419881_6598764015699771096_n.jpg

Notice the screws instead of solder - easier to take apart this way. The larger holes are big enough for mash bits to pass easily. That's really only a problem for the first few minutes of re-circulation - they should clear pretty quick.

Actually, ClaudiusB, I do add (mash) water first. After preheating, the grain is added and re-circulation stabilizes temperatures for the duration. Previously I used a silicone hose attached to a barb inside the tun but now the hose would sink to the bottom and grain would get added on top. I took the hose off for my test batches so wort during recirc just blasts across the center of the tun and hits the other side. This isn't ideal as the grain bed was heavily impacted by the force of the liquid hitting the vessel wall and splashing down. Essentially the top of the grain bed looked like a slide. I didn't notice efficiency degradation but I probably just wanted another problem to solve. Funny how these projects turn into more projects.

I'm hoping the ring is an improvement over the old way as it will spread the wort over the top of the grain bed more evenly while recirculating. It should also reduce the amount of splashing while recirculating and when grain is added, I can have the tun recirculating as a way to make sure grain hits water relatively evenly with a hot shower.
 
Hi ClaudiusB,

No major updates but I noticed the humidity (and/or barley flour) might be a bit much for the little solenoid. I took it apart and sanded things down to reduce the buildup (rust? wet flour?) and things keep chugging along. It's mighty nice getting 2 full batches done by 9am.

I bought another (bigger, stronger) solenoid but haven't put it in since everything is going fine. I'll post again if I end up doing a redesign to move the solenoid out of steam's reach.
 
Sorry, dogs, I'll head back and see if I can upload them somewhere else. I think I may have linked directly from facebook - even though I have not removed them, maybe permissions have changed or something.

Here is the side view:
http://s7.postimg.org/rok1s7oh7/grain_hopper_side_view.jpg

And underneath:
http://s16.postimg.org/fn9fauyf9/grain_hopper_underneath.jpg

Hopper when full (14.5 pounds of grain):
http://s21.postimg.org/nc1up1qxj/full_hopper.jpg

An older (from 2013) iteration of the shed layout, viewed from the front doors:
http://s18.postimg.org/5f5r70za1/shed.jpg

I really should start another thread for the sparge ring, but here are some photos.

Side:
http://s16.postimg.org/jim04wwcl/sparge_ring_side.jpg

Top view:
http://s23.postimg.org/6i0vv1c0b/sparge_ring_top.jpg

full hopper.jpg


grain hopper side view.jpg


grain hopper underneath.jpg


shed.jpg


sparge ring side.jpg


sparge ring top.jpg
 

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